Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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第10卷    第5期    总第38期    2000年10月

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胡连喜, 李小强, 王尔德, 丛  飞2

(1. 哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001;
2. 北京卫星制造厂, 北京 100080

摘 要: 利用透射电镜、 扫描电镜和拉伸试验等实验方法,研究了铸态和挤压态SiCw/ZK51A镁基复合材料的组织与力学性能。 结果表明, 挤压铸造SiCw/ZK51A复合材料经等温热挤压后, 其力学性能有很大提高。 主要原因是: 挤压变形能消除铸造缺陷,增强SiC晶须与ZK51A镁合金基体的界面结合, 使复合材料中SiC晶须发生定向分布, 沿挤压方向呈准一维分布特征, 晶须的增强承载能力得到充分发挥。


关键字:  SiC晶须; ZK51A镁合金;金属基复合材料; 挤压;组织性能

Extrusion deformation on microstructure and mechanical properties of SiCw/ZK51A magnesium matrix composite
HU Lianxi, LI Xiaoqiang, WANG Erde, CONG Fei2

1. School of Materials Science and Engineering,Harbin Institute of Technology, Harbin 150001, P.R.China;
2. Beijing Satellite Manufacturing Plant, Beijing 100080, P.R.China

Abstract:  The microstructure, fracture morphology, and mechanical properties of both squeeze cast and subsequently isothermally extruded SiCw/ZK51A magnesium matrix composite were experimentally investigated by means of transmission electron microscopy, scanning electron microscopy, and tension test respectively. The results show that the asextruded composite possesses much higher mechanical properties than the ascast composite, especially modulus of elasticity and mechanical strength. The main reason for this lies in that the extrusion deformation not only helps to improve the whisker/matrix interfacial bonding and to eliminate casting defects, but also makes the SiC whiskers tend to align uniformly and quasiunidirectionally in the extrusion direction, leading to excellent reinforcing effect by load transfer.


Key words: SiC whisker; ZK51A magnesium alloy; metal matrix composite; extrusion; microstructure and mechanical properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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